$highlight-color: #f90;
$basic-border: 1px solid black;
$nav-color:#f90;

#app {
  background-color: $highlight-color;
  border: $basic-border
}

nav {
  width: 100px;
  color: $nav-color;
  background-color: black;
}

#content {
  article {
    h1 {
      color: #1dc08a
    }

    p {
      font-style: italic;
    }

    a {
      color: blue;

      &:hover {
        color: red
      }
    }
  }

  aside {
    background-color: #f90
  }
}